Headline Details: ESTCube-2 is a 3U Cubesat. The primary transceiver is using 70 cm amateur radio band
for uplink and downlink purposes. It will be used to as
the beacon for simple overview of the satellite status
and as the main transceiver for receiving
tele-commands and firmware upgrades. As well
transmitting large amounts of mission data, like
telemetry data from each subsystem and the
experiment data in AX.25 data packet format with 9600
baud data-rate FSK/GFSK modulated signal with
experimental changing frequency up-to 38600 baud
using 2GFSK (or 4GFSK for testing) modulation
schemes.
During mission, it is planned to transmit telemetry
beacon periodically, typically once per minute,
containing packets from every subsystem. After special
planned request, low resolution image thumbnails will
be transmitted.
As part of Estonian educational campaign
satellite will transmit digital file and/or analog NBFM
signal. The Digipeater mode will be used to allow amateur
radio operates to use satellite for two-way digital
communication. 9600 bps GFSK AX.25 data uplink will
be in 2m amateur band and transmission of digipeated
packet in 70 cm radioamateur band. Transmission
speed and mode will be the same as for uplink.
The optional Doppler ranging experiment will be used
to determine satellite distance to Earth in order to
improve accuracy of satellite orbit determination. 2m
amateur band as uplink and 70 cm amateur band as
downlink is used for Doppler ranging method. In
addition, on-board the satellite is placed a corner
reflector for possible optical ranging.
High-speed communications system is an experimental
transceiver system, which is developed as spectrally
efficient communication system During
experiment stage system will downlink data in 5 GHz
amateur radio band, where possible data will be
satellite status packets, experiment data and full
resolution images from Earth observation camera. Data
will be downlinked starting with BPSK modulated 9600
bps data-rate up-to 32APSK modulated 25 Mbps
data-rate signa. GNU radio
based software tools will published before satellite
launch, in order to enable reception of high speed
downlink for amateur radio community.
70 cm amateur radio band downlink will be used to
send E-sail tether experiment and housekeeping data
of the payload module such as temperature
measurements, information about the attitude of
satellite, energy production etc.
After performing measurements of corrosion resistant
coating and radiation shielding material, 70 cm
amateur radio band downlink will be used to transmit
acquired sensor data. Sensors will measure resistance,
temperature and integrated radiation accumulated
while exposed to space environment during one or
multiple orbit periods. More info here https://drive.google.com/file/d/0B-TI7NbeuNSuUjcwSUhBTEg5UGc/view No launch opportunity has been identified but planning a 2019 deployment into a SSO.

Application Date:

03 Feb 2018

Freq coordination completed on

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